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Binding Element Attributes

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In addition to normal text, you may also want to have your templates contain HTML elements whose attributes are bound to the controller.

For example, imagine your controller has a property that contains a URL to an image:

<div id="logo">
  <img src={{logoUrl}} alt="Logo">
</div>

This generates the following HTML:

<div id="logo">
  <img src="http://www.example.com/images/logo.png" alt="Logo">
</div>

Binding multiple values

You can also bind multiple values to a single attribute:

<div class="{{priority}} {{placement}}"></div>

Binding boolean values

If you use data binding with a Boolean value, it will add or remove the specified attribute. For example, given this template:

<input type="checkbox" disabled={{isAdministrator}}>

For further control over how these values are applied, see the inline-if syntax documentation on the Conditionals page.

Adding data attributes

By default, view helpers do not accept data attributes. For example

{{#link-to "photos" data-toggle="dropdown"}}Photos{{/link-to}}

{{input type="text" data-toggle="tooltip" data-placement="bottom" title="Name"}}

renders the following HTML:

<a id="ember239" class="ember-view" href="#/photos">Photos</a>

<input id="ember257" class="ember-view ember-text-field" type="text" title="Name">

There are two ways to enable support for data attributes. One way would be to add an attribute binding on the view, e.g. Ember.LinkView or Ember.TextField for the specific attribute:

export default Ember.LinkView.reopen({
  attributeBindings: ['data-toggle']
});

export default Ember.TextField.reopen({
  attributeBindings: ['data-toggle', 'data-placement']
});

Now the same handlebars code above renders the following HTML:

<a id="ember240" class="ember-view" href="#/photos" data-toggle="dropdown">Photos</a>

<input id="ember259" class="ember-view ember-text-field"
       type="text" data-toggle="tooltip" data-placement="bottom" title="Name">

You can also automatically bind data attributes on the base view with the following:

export default Ember.View.reopen({
  init: function() {
    this._super();
    var self = this;

    // bind attributes beginning with 'data-'
    Em.keys(this).forEach(function(key) {
      if (key.substr(0, 5) === 'data-') {
        self.get('attributeBindings').pushObject(key);
      }
    });
  }
});

Now you can add as many data-attributes as you want without having to specify them by name.

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